Changeable type-blocks.



J. J. HQWARD.

GHANGEABLE TYPE BLOCKS,

Armmulon FILED JUNE 18, 1912,

93,131: Patented Sept.24,1912

i4; 4% v MZWWUENQTZZ/ llNllllElD @TATltbl PATENT JOHN J. HOWARD, 0FPITTSBURGH, PENNSYLVANIA, ASSIG-NOR T0 JAS. H. MATTHEWS & 00., OFPITTSBURGH, FENNSYLVANIA, A CORPORATION OF PENIQ'SYLVANYEA.

CHANGEAIBLE TYPE-BLOCKS.

manner.

Specification of Letters Eatent.

Patented Sept. r9122.

T 0 all whom it may concern Be it known that 1, JOHN J. Hownnn, acitizen of the United States, and residing in the city of Pittsburgh, inthe county of Allegheny and-State of Pennsylvania, have invented ordiscovered new and useful linprovements in Changeable Type-Blocks, ofwhich the following is a specification.

My invention consists in new and useful improvements in interchangeabletypeblocks which are used for stencihn or stamping and for snnllarpurposes. uch

type-blocks are commonly made of rubber or other compressible materialand are held onthe holder by the angular flanges of the latter engagingthe lateral edges or basefianges of the former. Owing to the viscosityof the ink used, the type tend to adhere to the surface being marked,frequently pulling the type-blocks loose from the holder and causingmuch inconvenience and delay.

My object is to prevent this loosening of the type-blocks from theholder, and I accomplish the same by providing the lateral edges or baseflanges of the type-blocks with grooves or troughs which, when the typeadhere to the surface being marked, engage and interlock with theangular flanges of the holder and prevent the loosening of thetype-blocks from the holder.

In the accompanying drawings, Figure 1 is a perspective of a holder ofthe rocker type with my improved type-blocks mounted thereon; Fig. 2 isa section of the same along the line ll-Jl in Fig. 1, but showing thetype-block bowed up as if adhering to the surface being printed; Fig. 8is a perspective of one of my type-blocks, and Fig.

4 is a vertical, transverse, sectional view of my type-block unprovedwith base-flanges.

.The following is a detailed description of the drawings:

A represents a type-holder, which for the sake of illustration is shownas a rocker holder, composed of face plate 1 provided at its end withrearwardly' bent portions 2-2 between which is secured the woodenhand-grasp 3. lt will be understood however, lhat my iu'iprovedtype-blocks may be tltlVtlIllHgl'QOllFl V used with any of the holdersnow in use. The holder A is provided along its lateral edges with metalflanges B-l composed of ayertical portion 4 and an inwardly extendmg,substantially horizontal, portion 5.

C@ are the typo-blocks having on their faces various letters, numbers orother features, as required. Said blocks are usually provided; withbasefianges 6-6 which are seated under the lateral flanges B-B of theholder to retain the type-blocks on the holder. It is evident that withno grooves ortroughs provided in the baseflanges of the type-blocks,when the said blocks are bowed outwardly, as shown in Fig. 2, by theadherence of the type to the surface being printed, said flanges wouldbe readily drawn from beneath the flanges B-B, thus releasing thetype-blocks from the holder. 1 provide, however, the flanges 6-6 withgrooves or troughs 7-4 in their upper surfaces which, when thetype-blocks are bowed upwardly as shown in Fig. 2, engage or interlockwith the flanges l3-B of the holder and render the forcible withdrawalof said base-flanges from beneath said holder-danges impossible.

In case the type-blocks are unprovided with base-flanges, as in Fig. 1,and the bases of the" blocks are engaged by the holderflanges, thegrooves or troughs "?-7 may be formed in the top faces of the type-blockadjacent to its lateral edges.

The type-blocks are mounted on the holder either by sliding the formerunder the flan es BB at one end of the holder or pincning the blocks soas to compress their bases sufficiently to permit the insertion of theirbase-flanges or lateral edges under said flanges B-B.

What I desire to claim is l. The combination with a holder, pro-- videdwith retaining-flanges extending along the longitudinal edges thereof,of removable type-blocks disposed in said holder and having, in theirupper faces, grooves extendiu parallel and adjacent to said flanges, saiflanges being normally out of engagement with said grooves, but engagingthe same when said type hlocks are bowed upward. I

2. The combination with a holder. provided with rotaining-ilaugescxteudingalong the longitudinal edges thereof, of removable lype-bl chsdisposed in said holder undhav- 'ing lateral base-flanges disposed undersaid flSignedi-mt Pittsburgh; Penna, this 13th retaining-flanges, andprovided in their upday of J inie' 1912. per faces, with groovesextending-paralll v V and adjacent to said retaining-flanges, said JOHNJ. HOWARD. v5 retaining-flanges being normally out of en gagement withsaid grooves, but engaging VVitnessesz' the same when said type-blocksar bowed WVILLI M Jnmsms, upward. Y J AS. MOILWRATH.

